Specifications

WELL mPBX-U110R Administrator's Guide
Page118
APPENDIX C How to Configure
NAT setting
When mPBX is behind a NAT(firewall),you need to configure NAT
setting on mPBX if you want to use a remote extension.
Please follow section 1 or 2 below depending on your network configuration.
1. If mPBX is connected to a local network, you must set up port forwarding
on your router. Specifically, you must map port 5060 (default SIP port) and
port 10001-10200(default RTP port range) as UDP ports.
Next, go to the mPBX web interface and configurethe SIP settings according
to Figure C-1:
External IP Address: your router’s public IP address
External Host: your router’s domain
ExternalRefresh Interval: 20 seconds
Local Network Identification:192.168.5.0/255.255.255.0 (change this
according to your network configuration)
NAT mode: Yes
Allow RTP Reinvite: No
Figure C-1
Assuming that your router’s host address is yeastar.3322.org, your local
network is from 192.168.5.1-192.168.5.254, and the subnet Mask is
255.255.255.0, the mPBX network settings should configured like Figure
C-2